[antisthenes]

> A great designer can figure out that this particular product should actually be using magic links and not passwords.

If your designers are needing to generate input on technical issues like this, your product is already in trouble.

[befictious]

If your designers are only picking colors, fonts, and spacing then you don't have designers, you have software art directors.

[lavela]

If you frame that issue as a purely technical one without ux/usability implications, where you'd absolutely want to have a (good) designer in the loop, your product is in trouble, too.